190PO    194RN A DECAY (0.78 MS)       2006AN36                  20NDS    202011
190PO  H TYP=FUL$AUT=Balraj Singh,{+1} and Jun Chen{+2}$CIT=NDS 169, 1 (2020)$
190PO2 H CUT=15-Oct-2020$
190PO c  First identification of {+194}Rn nuclide by 2006An36.
190PO c  2006An36: {+194}Rn was produced and identified in {+144}Sm({+52}Cr,2n)
190PO2c  reaction at E=236 MeV on a {+144}SmF{-3} rotating target on a carbon
190PO3c  backing at UNILAC heavy-ion facility of GSI, with SHIP velocity filter
190PO4c  for separating evaporation residues. Several different types of
190PO5c  detectors were used: the decays of the evaporation residues were
190PO6c  measured by implanting residues in a thick 16-strip position-sensitive
190PO7c  silicon detector (PSSD) with a typical FWHM|?20 keV for |a particles
190PO8c  in 6-8 MeV range. An array of six silicon detectors of similar shape
190PO9c  (BOX detectors), mounted upstream of PSSD detector, was used to
190POac  measure the energies of |a, |b and conversion electrons. Three thin
190PObc  time-of-flight detectors in front of the PSSD and BOX detectors
190POcc  permitted identification of reaction products from the scattered beam
190POdc  particles; and distinction between the decay events and implantation
190POec  events through anti-coincidence technique. An additional thick Si
190POfc  detector was installed as a veto detector behind the PSSD detector in
190POgc  an anti-coincidence mode. This allowed distinction between the decays
190POhc  and the punch-through events (from high-energy protons and |a particles
190POic  produced in the reactions on the carbon backing). For |g rays, a
190POjc  four-fold segmented Clover Ge detector was used behind the PSSD
190POkc  detectors for prompt and delayed |g(residues) coin and/or |a|g coin
190POlc  measurements. Identification of the isotope by time and position
190POmc  correlation of |a decays from {+194}Rn with the known |a decays from
190POnc  daughter isotope {+190}Po and grand-daughter {+186}Pb. Measured |a, |g,
190POoc  |a|g coin, |a(residues) coin, |g(residues) coin. Deduced evidence
190POpc  and T{-1/2} of {+194}Rn parent
190PO cA HF$Deduced r{-0}({+190}Po)=1.590 fm {I11}, assuming 100% g.s. to g.s.
190PO2cA decay, and HF=1 for this transition
194RN  P  0            0+                0.78 MS 16              7862     10
194RN cP E$Assumed as the ground state of {+194}Rn
194RN cP T$Half-life (2006An36) determined from analysis of 26 full-energy
194RN2cP correlated (recoil)(7700 |a) decays
194RN cP QP$From 2017Wa10.
190PO  N                        1
190PO cN BR$%|a assumed 100
190PO  A  7624
190PO cA $Search for fine structure in |a decay revealed only one event
190PO2cA E|a=7624 which is either from {+194}Rn decay or from an escape event
190PO  L 0             0+
190PO  A  7700     10 100       1
190PO cA $Reduced |a-decay width |d{+2}{-|a}=267 keV {I58} (2006An36)